/**
 * Copyright (c) 2021 OceanBase
 * OceanBase CE is licensed under Mulan PubL v2.
 * You can use this software according to the terms and conditions of the Mulan PubL v2.
 * You may obtain a copy of Mulan PubL v2 at:
 *          http://license.coscl.org.cn/MulanPubL-2.0
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PubL v2 for more details.
 */

#ifndef OCEANBASE_SQL_OB_EXPR_CUR_TIME_H_
#define OCEANBASE_SQL_OB_EXPR_CUR_TIME_H_

#include "sql/engine/expr/ob_expr_operator.h"

namespace oceanbase {
namespace sql {
class ObExprUtcTimestamp : public ObFuncExprOperator {
  public:
  explicit ObExprUtcTimestamp(common::ObIAllocator& alloc);
  virtual ~ObExprUtcTimestamp();
  virtual int calc_result_type0(ObExprResType& type, common::ObExprTypeCtx& type_ctx) const;
  virtual int calc_result0(common::ObObj& result, common::ObExprCtx& expr_ctx) const;
  static int eval_utc_timestamp(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
  virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;

  private:
  // disallow copy
  DISALLOW_COPY_AND_ASSIGN(ObExprUtcTimestamp);
};

class ObExprCurTimestamp : public ObFuncExprOperator {
  public:
  explicit ObExprCurTimestamp(common::ObIAllocator& alloc);
  virtual ~ObExprCurTimestamp();
  virtual int calc_result_type0(ObExprResType& type, common::ObExprTypeCtx& type_ctx) const;
  virtual int calc_result0(common::ObObj& result, common::ObExprCtx& expr_ctx) const;
  static int eval_cur_timestamp(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
  virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;

  private:
  // disallow copy
  DISALLOW_COPY_AND_ASSIGN(ObExprCurTimestamp);
};

class ObExprSysdate : public ObFuncExprOperator {
  public:
  explicit ObExprSysdate(common::ObIAllocator& alloc);
  virtual ~ObExprSysdate();
  virtual int calc_result_type0(ObExprResType& type, common::ObExprTypeCtx& type_ctx) const override;
  virtual int calc_result0(common::ObObj& result, common::ObExprCtx& expr_ctx) const override;
  static int eval_sysdate(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
  virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;

  private:
  // disallow copy
  DISALLOW_COPY_AND_ASSIGN(ObExprSysdate);
};

class ObExprCurDate : public ObFuncExprOperator {
  public:
  explicit ObExprCurDate(common::ObIAllocator& alloc);
  virtual ~ObExprCurDate();
  virtual int calc_result_type0(ObExprResType& type, common::ObExprTypeCtx& type_ctx) const;
  virtual int calc_result0(common::ObObj& result, common::ObExprCtx& expr_ctx) const;
  static int eval_cur_date(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
  virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;

  private:
  // disallow copy
  DISALLOW_COPY_AND_ASSIGN(ObExprCurDate);
};

class ObExprCurTime : public ObFuncExprOperator {
  public:
  explicit ObExprCurTime(common::ObIAllocator& alloc);
  virtual ~ObExprCurTime();
  virtual int calc_result_type0(ObExprResType& type, common::ObExprTypeCtx& type_ctx) const;
  virtual int calc_result0(common::ObObj& result, common::ObExprCtx& expr_ctx) const;
  static int eval_cur_time(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
  virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;

  private:
  // disallow copy
  DISALLOW_COPY_AND_ASSIGN(ObExprCurTime);
};
}  // namespace sql
}  // namespace oceanbase
#endif  // OCEANBASE_SQL_OB_EXPR_CUR_TIME_H_
